TM 9-2330-246-14
4-55. SERVICE BRAKE ADJUSTMENT (SINGLE WHEEL CYLINDER) (Con't).
Turn front brakeshoe adjusting cam (2) clockwise until brakedrum (11) drags slightly when hub and brakedrum
3.
are turned by hand. Turn adjusting cam counterclockwise just enough to allow hub and brakedrum to rotate
freely, Make adjustment of both cams as uniform as possible.
4.
Repeat steps 2 and 3 for other wheel, making adjustments as uniform as possible.
MAJOR ADJUSTMENT
b.
Remove nut (8), Iockwasher (9), and access cover (1 O) from brakedrum (1 1).
1.
Rotate brakedrum (11) until inspection hole (12) is 1 in. (3.8 cm) above lower end of rear brakeshoe. Insert
2.
feeler gage in inspection hole to determine clearance between brakeshoe and brakedrum. Clearance should
be 0.010 in. (0.25 cm).
To adjust clearance between brakeshoe and brakedrum (11), loosen rear anchor pin nut (5) on backside of
3.
backing plate (7). Hold nut and turn anchor pin (6) until 0.010 in. (0.25 cm) clearance is obtained. To reduce
clearance, turn anchor pin clockwise. To increase clearance, turn anchor pin counterclockwise.
Rotate brakedrum (11) until inspection hole (12) is 1 in. (3.8 cm) below upper end of rear brakeshoe. Insert
4.
feeler gage in inspection hole to determine clearance between brakeshoe and brakedrum. Clearance should
be 0.020 in. (0.05 cm).
To adjust clearance between brakeshoe and brakedrum (11), turn rear brakeshoe adjusting cam (1) until
5.
clearance between brakeshoe and brakedrum is 0,020 in. (0.51 cm). To reduce clearance, turn adjusting cam
counterclockwise. To increase clearance, turn adjusting cam clockwise. Check to ensure that 0.010 in.
(0.25 mm) clearance is maintained at lower end of rear brakeshoe.
Adjust clearance between lower and upper ends of front brakeshoe and brakedrum (11) as described above.
6.
Clearance between lower end of front brakeshoe and brakedrum is decreased by turning front anchor pin (3)
counterclockwise and increased by turning anchor pin clockwise. Clearance between upper end of front
brakeshoe and brakedrum is increased by turning front brakeshoe adjusting cam (2) counterclockwise and
decreased by turning adjusting cam counterclockwise.
Hold anchor pins (3 and 6) and tighten nuts (4 and 5). Check brakeshoe clearance.
7.
Install access cover (1 O) on brakedrum (11) using new Iockwasher (9) and nut (8).
8.
Repeat steps 1 through 8 from other wheel, making adjustments as uniform as possible.
9.
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